Can We Use Auto Paint Meter Test Plastic Bumper?

From:Linshang Time:2019/08/28 11:31:00 Browse:314
There are different brands of auto paint meters on the market, but most auto paint meters are measured with Fe (with iron basis) and Fe (with non-ferrous basis). So far there is no auto paint meter whose substrate is plastic.

There are different brands of auto paint meters on the market, but most auto paint meters are used to measure the paint thickness on metal substrates. Let's take the Linshang LS220 auto paint meter as an example to explain why the plastic bumper can't be tested with the auto paint meter that use magnetic and eddy current principles. The main reasons are as follows:

1. Eddy current and magnetic auto paint meter

(1) Magnetic and Eddy current auto paint meter    

The general auto paint meter adopts the magnetic and eddy current principles to measure the automotive surface paint thickness.  We know that the power plant generates a magnetic field that in turn produces a power plant. But they are still based on metal substrate.

a. Magnetic auto paint meter principle

Magnetic auto paint meter is suitable for measuring the non-magnetic coating thickness on magnetic metal substrates.It is based on measuring the coating film thickness by using the magnetic flux of the probe through the non-ferromagnetic coating to enter the ferromagnetic substrate. The coating thickness can also be determined by measuring the magnitude of the magnetic resistance corresponding to the threshold. 

b. Eddy current auto paint meter principle

Eddy current auto paint meter is used to measure non-conductive coating thickness on non-magnetic metal substrates. The coil core in the eddy current coating thickness gauge probe is usually made of a high-frequency material such as platinum-nickel alloy, which generates a high-frequency electromagnetic field in the coil by the current. After contacting of the conductor (metal substrate) at the probe and the bottom, eddy currents are formed on the metal substrate.  

(2) Ultrasonic auto paint meter principle

Plastics, which are not electrically conductive in our lives, are insulators and do not generate magnetic fields. Therefore, this situation does not apply to the principle of Fe Hall effect and NFe eddy current. Therefore, plastic bumpers cannot be measured with the magnetic and eddy current auto paint meter.

If you want to measure the coating thickness on plastics, ultrasonic auto paint meter is recommended.   An ultrasonic technique is used when measuring the paint thickness over non-metal substrates such as plastic and fiberglass. The probe of the auto paint meter contains an ultrasonic transducer that sends a pulse through the coating. The pulse reflects back from the substrate to the transducer and is converted into a high frequency electrical signal that is analyzed to determine coating thickness. In some circumstances, individual layers in a multi-layer system can be measured. Prices range between $1,800 and $4,000.

LS220 auto paint meter

LS220 Auto Paint Meter

2. LS220 auto paint meteris based on the Chinese national standard

"T 4956-2003" magnetic substrate on the non-magnetic cover layer thickness measurement - "GB / T 4957-2003" non-conductive coating thickness measurement on non-magnetic metal substrates- eddy current law. The above two Chinese national standards are based on "magnetic substrates" and "non-magnetic metal substrates". The plastic materials are not metal or magnetic. Therefore, plastic bumpers cannot be measured with the auto paint meter.

3. Best auto paint meter

Simple zero adjustment to ensure accuracy
Measure coating thickness on metal substrates
Wear-proof ruby probe
Temperature compensation function
Price: $118
Model: LS220
Simple zero adjustment to ensure accuracy
Measure coating thickness on metal substrates
Bluetooth function
Temperature compensation function
Price: $148
Model: LS220B
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